×[ -( -0.25)] | [1.9-1.9×(1.9-1.9)]+1.9 | 8×3 ÷[1÷(3 -2.95)]. |
×[
-(
-0.25)]=
×
-
×(
-
)=
-
×
=
-
= ;[1.9-1.9×(1.9-1.9)]+1.9 =[1.9-1.9×0]+1.9 =1.9+1.9 =3.8; 8×3 ÷[1÷(3 -2.95)]=8× ÷[1÷0.25]=8× ×![]() = . |
分析:利用四则运算顺序与法则解答,能简算的可以简算.
点评:此题考查利用四则混合运算顺序解决问题.
÷[1÷(3
-2.95)].
;
÷[1÷0.25]
.